Lawn-mower sharpener.



J. H. PRBY. LAWN MOWER SHABPENER. zHBwa-rmi FEET mi. n. 1908.

Q 903,371, Paten ted Nov. 10,1908.

Witnesses lransvmxso Frction pr with said plate.

UNIT- D sfrAtras PATENT OFFICE.

JAMES HENRY FREY, OF VINOENNES, INDIANA, ASSIGNOR OF ONE- HALF TO FRANK HARDAGRE, OF VI'NGENNES, INDIANA.

LAWN- MOWER SHARPENER.

Specification of Letters Patent.

Patented Nov/10, 19 08.

Application filed March 11, 1908. SerlatNo. 420,467.

It has for its object to remedy certain o jQCtlOIIS'OI draw backs in the use of the aforesaid subject matter, cs )ecially in its application and adjustment for practioal use, as willbehereinafter pointed out.

Said invention consists of certain Features or instrumentalities substantially as: hereinafter more fully disclosed and paiecularly pointed out by the claims.

In the accompanying drawings, illnstrating the preferred embodiment. of my invcn-- artly in seethe sharp tion, Figure 1 is a side view, p tion, showingtle appl' ener to a lawn xmiwt-r. plan view of the longitudinal section ward end ot the slam-pence.

Similar numerals of refercnm rc cluploy'od to indicate correspontlu parts throughout the several figures of the draw-- :in s.

in carrying out my invention I employ a plate 1. which hasthe general (illtlltlClltllStW5 of the plate used for a like purpose in the aforesaid Letters Patent, and provided as in said Letters Patent with. an a-brading or sharpening core or stom 3 containctfl in a casing 2 of preferably soft metal and hav ing a dovetail. or detachable connection 2 The plate has a rearward extensiouor arm 10 provided with an clongated slot ll the opposite longitudinal walls of which are undercut or beveled in the direction of the base of said plate, as shown.

Arranged.upon the plate 1. is a wheel or nut 5 having its periphery provided with screw threads .1- and its axis 7 provided with a screw llarcmlud conne tion with said plate I, said not or u'hcol, however, h ring); ant-lu'cadcd and movable iudcpcnrlcutly of its axis, it being held in place by KL llari-d enl of its axis routing in a counlrr -sinl: therooi The yoke member 8, arranged transversely with relation to said nut or-whe' has its opposite inner surfaces provided with rack teeth, and extending down through opposite slots in the plate 1, said rack or teeth onsaid yoke having engagement with the screwv threads of said nut or wheel, provided for the verticaladjustment of said yoke, the

ing as supports which rest upon the ledger bar of a lawn mower when the device is in use.

of corresponding outline, and arranged'to slide or move within theslot 11 of the plate extension 10. Said screw 12 has, also, at its upper end a preferably milled or knurled actuating head 14, and intermediatel of said head'and slide is also a knurled head screw and serve as a jam nut for the retention of said slide 1n fixed position.

i, with the device in position upon a lawn n'u'nvcr, the same being in inverted position, the lower ends of the yoke "together with the cm'rcspoiuling end of the screw 12- rest upon the ledger bar of said lawn mower with the alu'inlin member or core and casing :2 arranged for engagement with the knives oi the lawn mower'as they are revolved by suitable means, prcfe'ably as described in said patent, to provide for the read sharpcuing of said knives or cutters, w ich, of course, is etfected without the removal of said knives from the lawn mower.

It. will be noted that by means of the aforesaid arrangement of parts, the yoke int-unhcr adapted to have its lower su porting and; to be adjusted simultaneous or uniformly .in effecting the vertical adjustment. of the sharpener bearing plate, whereby said sharpener with. its casing are adapted to be evenly presculml to the action of the knives or cutters of the lawnmower, and thus provide for the wearing away of said abri'uling or ahar mniug device evenly and uniformly.- Also, it will be noted that by this uniform wearing away of the abrading' or sharpening nicinl'ier, its lasting qualities will be also 'pimumtml as is apparent. Also,

in the use of the jam nut, screw 12 and its sliding bearing l3",*simplicity is promoted in dispensing with the her, of additional screws and, also, provides for convenience of. ad-

A screw 12 has its bearing in a slide 13 member or nut 15 adapted to engage saidloweror vertical portions of said yoke serv- As will be observed by reference to Fig.

justment of the abrading bearing plate to walls of the slot, a clamp nut having a the led er bar of the lawn mower. v i threaded connection with said screw and ar- 40 It wi lv be understood that latitude may be ranged to engage the upper end of said exprovided herein for making changes in r'etension or arm, a screw threaded wheel or 5 gard tovarious detailsof the construction,arnut having .pivotal connection with said rangement and disposition of the parts withsharpener carrying plate, and a yoke havout departing from the spirit of my invening opposite racks upon its inner surfaces 45 tion. adapted for engagement with said screw What is claimed is: threaded wheel or nut, the lower ends of 1. A. device-of the class described includsaid yoke being adapted to serve as a suping a sharpener bearing plate, a screw port for the opposite end of said sharpener threaded wheel or nut having its axis or hearing plate. 50 bearin arranged in said plate, a yoke ar- 4. A device of the class described includrangef transversely of said nut or wheel, ing a sharpener bearing plate, a threaded with its inner surfaces adapted to have enmember mounted for rotation on said plate, vga ement with the screw thread of said nut and a yoke .embracing the threaded member and its lower end to form bearin s or supand provided with means for engagement 55 ports for said plate, and additiona supportwith the threads on said member, the ends of mg means for said plate arranged in connecthe yoke formin supports for said late. tion therewith. 5. A device 0% the class describe includ- 2. A device of the class described including a sharpener bearin plate provided with a nut or screw threaded wheel having ivotal i or rotatable connection with said plate, a yoke arran ed transversely of said nut or wheel and aving its vertical portions extending downwardly below said plate to form bearings or supports, said .yoke havin its .inner surface provided with teeth or racks effective for eng ement with said nut. T 3. A device of the c ass described includinga sharpener bearing late havi a lon itu inally slotted-arm, t ewalls o the s 0t being undercut, a screw'servingas a suport for one-end of said plate, a slide or arin for said screw arranged in the slot of sai arm and having its side walls inclined forengagement with the undercut mounted for rotation on the upper surface of the late and having its exterior walls threade a yoke embracing the threaded member and provided with op 'ositely disposed arms, the inner faces 0 which are provided with teeth for engagement with the threads on said member, the ends of the arms forming sup orts for said plate and an abrading inem er secured to the ower surface of the plate. a

. In testimony that I claim theforegoing as 7 my own, I have heretoafiixed my signature in the presence of two witnesses.

JAMES HENRY FREY. Witnesses: 1

WILL. DAwAnr'. W. F. Gwm.

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